CA1322906C - Low-friction, boat-type rocker arm - Google Patents
Low-friction, boat-type rocker armInfo
- Publication number
- CA1322906C CA1322906C CA000598608A CA598608A CA1322906C CA 1322906 C CA1322906 C CA 1322906C CA 000598608 A CA000598608 A CA 000598608A CA 598608 A CA598608 A CA 598608A CA 1322906 C CA1322906 C CA 1322906C
- Authority
- CA
- Canada
- Prior art keywords
- rocker arm
- axle
- opening
- roller
- boat
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
- F01L1/12—Transmitting gear between valve drive and valve
- F01L1/14—Tappets; Push rods
- F01L1/16—Silencing impact; Reducing wear
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
- F01L1/12—Transmitting gear between valve drive and valve
- F01L1/18—Rocking arms or levers
- F01L1/181—Centre pivot rocking arms
- F01L1/182—Centre pivot rocking arms the rocking arm being pivoted about an individual fulcrum, i.e. not about a common shaft
- F01L1/183—Centre pivot rocking arms the rocking arm being pivoted about an individual fulcrum, i.e. not about a common shaft of the boat type
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49229—Prime mover or fluid pump making
- Y10T29/49295—Push rod or rocker arm making
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T74/00—Machine element or mechanism
- Y10T74/20—Control lever and linkage systems
- Y10T74/20576—Elements
- Y10T74/20582—Levers
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T74/00—Machine element or mechanism
- Y10T74/20—Control lever and linkage systems
- Y10T74/20576—Elements
- Y10T74/20882—Rocker arms
Abstract
ABSTRACT OF THE DISCLOSURE
A low-friction, boat-type, cold-formed rocker arm is provided. The rocker arm is of generally U-shaped config-uration in transverse cross section throughout most of its length. An intermediate portion of the rocker arm has a concave interior surface extending there-across with a cen-tral opening through which a shank of a pedestal extends.
One end portion of the rocker arm has a concave recess facing downwardly to receive the upper end of a push rod. The other end portion of the rocker arm has a rectangular opening in the bottom thereof. An axle extends between side walls of the rocker arm above the rectangular opening and a roller is rotatably mounted on the axle and has a circumferential portion exposed at the rectangular opening.
The roller engages an end of a valve stem with rolling, rather than sliding, contact, resulting in lower friction during operation of the rocker arm.
A low-friction, boat-type, cold-formed rocker arm is provided. The rocker arm is of generally U-shaped config-uration in transverse cross section throughout most of its length. An intermediate portion of the rocker arm has a concave interior surface extending there-across with a cen-tral opening through which a shank of a pedestal extends.
One end portion of the rocker arm has a concave recess facing downwardly to receive the upper end of a push rod. The other end portion of the rocker arm has a rectangular opening in the bottom thereof. An axle extends between side walls of the rocker arm above the rectangular opening and a roller is rotatably mounted on the axle and has a circumferential portion exposed at the rectangular opening.
The roller engages an end of a valve stem with rolling, rather than sliding, contact, resulting in lower friction during operation of the rocker arm.
Description
This invention relates to a cold-formed rocker arm and more particularly to a low-friction, boat-type rocker arm.
The new rocker arm is cold-formed and is designed to operate with lower friction. The rocker arm has an inter-mediate portion which is supported by a pedestal. One end of the rocker arm has a downwardly-facing recess which re-ceives an end of a push rod. The other end of the rocker arm has an opening with a roller being mounted on an axle extending between side walls of the rocker arm and having a circumferential portion exposed at the opening. The roller contacts an end of a valve stem with a rolling, rather than a sliding, motion. This results in lower friction during operation of the rocker arm and the engine.
It is, therefore, a principal object of the invention to provide a boat-type rocker arm which results in lower friction during operation.
Another object of the invention is to provide a cold-formed, boat-type rocker arm which carries a roller at one end positioned to contact an end of a valve stem with a rolling rather than a sliding motion.
Many other objects and advantages of the invention will be apparent from the following detailed description of a preferred embodiment thereof, reference being made to the accompanying drawings, in which:
Fig. 1 is a fragmentary, somewhat schematic side view in elevation of a rocker arm assembly in accordance with the invention, mounted on an engine shown in cross section;
Fig. 2 is an enlarged view in longitudinal cross section taken through the rocker arm assembly of Fig. 1, with extreme positions of the rocker arm shown in dotted lines;
Fig. 3 is a top view of the rocker arm; and Fig. 4 is a view in transverse cross section taken along the line 4-4 of Fig. 3.
Referring to the drawings and particularly to Fig. 1, a rocker arm assembly in accordance with the invention is indi-cated at 10 and includes an elongate, cold-formed boat-type rocker arm 12 mounted on a supporting pedestal 14. A suit-able threaded fastener 16 extends through a bore in the pedestal 14 and mounts the ass~mbly on a cylinder head 18 of an engine block. One end of the rocker arm 12 engages the upper end of a push rod 20 and the other end of the rocker arm engages the upper end of a valve stem 22. The valve stem extends upwardly from a val-re (not shown) in the cylin-der head through a coiled compression spring 24 located there-around and which is between the cylinder head 1~ and a retainer ring 26 mounted-on-the valve stem 22.
Referring to Figs. 2 and 3, the rocker arm 12 has an intermediate recessed area or surface 28 which is of generally semi-cylindrical shape. The recess 2~ has a central opening 30 through which a shank 32 of the pedestal 14 extends. The pedestal 14 also includes a fulcrum 34 with a lower, down-wardly-facing surface 36 of a predetermined radius. The surface 36 engages the recessed surfsce 28 of the rocker arm and supports the arm for rocking movement.
One end portion of the rocker arm 12 has a concave re-cess 38 facing downwardly with a lubricating hole 40 communi-cating with the recess and with the interior of the rocker arm. The recess 38 engages the upper end of the push rod 20 with the push rod causing the rocking motion of the rocker arm 12.
The other end portion of the rocker arm 12 has a rec-tangular end opening 42 which extends between side walls 44 and 46 of the rocker arm and almost to an end wall 47 thereof.
The side walls 44 and 46 have aligned round openings 48 and 50 which receive an axle 52. The axle 52 has flared ends 54 and 56 which are received in flared ends 58 and 60 of the openings 48 and 50 to prevent longitudinal and rota-tional movement of the axle 52. A roller 62, which extends a substantial portion of the distance between the side walls 44 and 46, is rotatably supported on the axle 52. A portion of the circumference of the roller 62 is exposed at the opening 42 and extends at least partly through the opening 42, as ~hown in Figs. 2 and 4. The roller 62 is positioned to engage the end of the valve stem 22~ thus establishing rolling motion 1 322~06 between the valve stem and the rocker arm 12 rather than sliding motion between the valve stem and the end of the rocker arm, as has here~ofore been the case. This rolling motion results in lower friction during the operation of the rocker arm and the engine, thereby improving the effi-ciency of the engine.
In one form, the lower circumferential extremity of the roller 62 is flush with the lower side edges of the rectangular opening 42 so that the roller can contact the end of the valve stem 22 in the same position as if the lower surface of the rocker arm end were solid instead of having the opening 42 and the roller 62. This enables the rocker arm 12 to be substituted for a conventional one lS without requiring changes in dimensions or positions of any of the engine components.
Various modifications of the above-described embodiment of the invention will be apparent to those skilled in the art and it is to be understood that such modifications can be made without departing from the scope of the invention, if they are within the spirit and the tenor of the accom-panying claims.
The new rocker arm is cold-formed and is designed to operate with lower friction. The rocker arm has an inter-mediate portion which is supported by a pedestal. One end of the rocker arm has a downwardly-facing recess which re-ceives an end of a push rod. The other end of the rocker arm has an opening with a roller being mounted on an axle extending between side walls of the rocker arm and having a circumferential portion exposed at the opening. The roller contacts an end of a valve stem with a rolling, rather than a sliding, motion. This results in lower friction during operation of the rocker arm and the engine.
It is, therefore, a principal object of the invention to provide a boat-type rocker arm which results in lower friction during operation.
Another object of the invention is to provide a cold-formed, boat-type rocker arm which carries a roller at one end positioned to contact an end of a valve stem with a rolling rather than a sliding motion.
Many other objects and advantages of the invention will be apparent from the following detailed description of a preferred embodiment thereof, reference being made to the accompanying drawings, in which:
Fig. 1 is a fragmentary, somewhat schematic side view in elevation of a rocker arm assembly in accordance with the invention, mounted on an engine shown in cross section;
Fig. 2 is an enlarged view in longitudinal cross section taken through the rocker arm assembly of Fig. 1, with extreme positions of the rocker arm shown in dotted lines;
Fig. 3 is a top view of the rocker arm; and Fig. 4 is a view in transverse cross section taken along the line 4-4 of Fig. 3.
Referring to the drawings and particularly to Fig. 1, a rocker arm assembly in accordance with the invention is indi-cated at 10 and includes an elongate, cold-formed boat-type rocker arm 12 mounted on a supporting pedestal 14. A suit-able threaded fastener 16 extends through a bore in the pedestal 14 and mounts the ass~mbly on a cylinder head 18 of an engine block. One end of the rocker arm 12 engages the upper end of a push rod 20 and the other end of the rocker arm engages the upper end of a valve stem 22. The valve stem extends upwardly from a val-re (not shown) in the cylin-der head through a coiled compression spring 24 located there-around and which is between the cylinder head 1~ and a retainer ring 26 mounted-on-the valve stem 22.
Referring to Figs. 2 and 3, the rocker arm 12 has an intermediate recessed area or surface 28 which is of generally semi-cylindrical shape. The recess 2~ has a central opening 30 through which a shank 32 of the pedestal 14 extends. The pedestal 14 also includes a fulcrum 34 with a lower, down-wardly-facing surface 36 of a predetermined radius. The surface 36 engages the recessed surfsce 28 of the rocker arm and supports the arm for rocking movement.
One end portion of the rocker arm 12 has a concave re-cess 38 facing downwardly with a lubricating hole 40 communi-cating with the recess and with the interior of the rocker arm. The recess 38 engages the upper end of the push rod 20 with the push rod causing the rocking motion of the rocker arm 12.
The other end portion of the rocker arm 12 has a rec-tangular end opening 42 which extends between side walls 44 and 46 of the rocker arm and almost to an end wall 47 thereof.
The side walls 44 and 46 have aligned round openings 48 and 50 which receive an axle 52. The axle 52 has flared ends 54 and 56 which are received in flared ends 58 and 60 of the openings 48 and 50 to prevent longitudinal and rota-tional movement of the axle 52. A roller 62, which extends a substantial portion of the distance between the side walls 44 and 46, is rotatably supported on the axle 52. A portion of the circumference of the roller 62 is exposed at the opening 42 and extends at least partly through the opening 42, as ~hown in Figs. 2 and 4. The roller 62 is positioned to engage the end of the valve stem 22~ thus establishing rolling motion 1 322~06 between the valve stem and the rocker arm 12 rather than sliding motion between the valve stem and the end of the rocker arm, as has here~ofore been the case. This rolling motion results in lower friction during the operation of the rocker arm and the engine, thereby improving the effi-ciency of the engine.
In one form, the lower circumferential extremity of the roller 62 is flush with the lower side edges of the rectangular opening 42 so that the roller can contact the end of the valve stem 22 in the same position as if the lower surface of the rocker arm end were solid instead of having the opening 42 and the roller 62. This enables the rocker arm 12 to be substituted for a conventional one lS without requiring changes in dimensions or positions of any of the engine components.
Various modifications of the above-described embodiment of the invention will be apparent to those skilled in the art and it is to be understood that such modifications can be made without departing from the scope of the invention, if they are within the spirit and the tenor of the accom-panying claims.
Claims (5)
1. A boat-type rocker arm assembly comprising a pedestal having a fulcrum and a shank, said fulcrum extending outwardly beyond two opposite sides of said shank, said fulcrum having curved lower surfaces of a predetermined radius, an elongate, cold-formed, boat-type rocker arm of generally U-shaped configuration in transverse cross section throughout most of its length and having an intermediate curved interior surface extending there-across between its ends, said interior surface being straight as viewed in transverse cross section, said rocker arm having an opening centrally located in the intermediate surface through which said shank of said pedestal extends, one end portion of said rocker arm having a concave recess adapted to receive the upper end of a push rod or the like, the other end portion of said rocker arm having a rectangular opening therein, side walls of said rocker arm above said rectangular opening having round openings therein, an axle extending through said round openings and mounted in said side walls for prevention of longitudinal movement of said axle, and a roller rotatably mounted on said axle and having a circumferential portion exposed at said rectangular opening whereby said roller can engage a valve stem.
2. A rocker arm assembly according to claim 1 character-ized by a circumferential portion of said roller being flush with lower side edges of said rectangular opening.
3. A boat-type rocker arm which is cold-formed, said rocker arm being of generally U-shaped configuration in transverse cross section substantially throughout its length and having a curved interior surface with a central opening to receive a shank of a pedestal, one end portion of said rocker arm having means adapted to receive an end of a push rod or the like, the other end portion of said rocker arm having an end opening therein, side walls of said rocker arm above said end opening having round openings therein, an axle extending through said round openings and mounted in said said side walls for prevention of longitudinal movement of said axle, and a roller rotatably mounted on said axle and having a circumferential portion exposed at said end opening whereby said roller can engage a valve stem.
4. A rocker arm according to claim 3 characterized by a circumferantial portion of said roller being flush with lower side edges of said end opening.
5. A boat-type rocker arm of generally U-shaped con-figuration in transverse cross section substantially through-out its length and having a central opening to receive a shank of a pedestal, one end portion of said rocker arm having a recess adapted to receive an end of a push rod or the like, the other end portion of said rocker arm having an end open-ing therein, an axle mounted in side walls of said rocker arm above said end opening, and a roller rotatably mounted on said axle and having a circumferential portion exposed at said end opening and being flush with lower side edges of said end opening whereby said roller can engage a valve stem.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US07/241,062 US4848180A (en) | 1988-09-06 | 1988-09-06 | Low-friction, boat-type rocker arm |
| US07/241,062 | 1988-09-06 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1322906C true CA1322906C (en) | 1993-10-12 |
Family
ID=22909094
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000598608A Expired - Fee Related CA1322906C (en) | 1988-09-06 | 1989-05-03 | Low-friction, boat-type rocker arm |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US4848180A (en) |
| JP (1) | JP2802099B2 (en) |
| CA (1) | CA1322906C (en) |
| DE (1) | DE3929493C2 (en) |
Families Citing this family (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| IT1240107B (en) * | 1990-02-16 | 1993-11-27 | Ferrari Spa | VARIABLE DISTRIBUTION SYSTEM, IN PARTICULAR FOR AN ENDOTHERMAL ENGINE. |
| US4979475A (en) * | 1990-05-25 | 1990-12-25 | Henley Manufacturing Holding Company, Inc. | Rocker arm with rounded channel to engage a valve stem with semi-spherical end |
| US5048475A (en) * | 1991-01-17 | 1991-09-17 | Henley Manufacturing Holding Company, Inc. | Rocker arm |
| US5123384A (en) * | 1991-10-21 | 1992-06-23 | Henley Manufacturing Holding Company, Inc. | Pedestal-mounted rocker arm with bushing |
| US5207191A (en) * | 1992-08-31 | 1993-05-04 | Henley Manufacturing Holding Company, Inc. | Boat-type rocker arm with stiffening member |
| US5372097A (en) * | 1992-12-18 | 1994-12-13 | Welles Manufacturing | Self-lubricating cam follower |
| US5575064A (en) * | 1994-12-06 | 1996-11-19 | Honda Giken Kogyo Kabushiki Kaisha | Process for producing rocker arm for internal combustion engine |
| US5720245A (en) * | 1995-11-13 | 1998-02-24 | Sandco Automotive Limited | Finger follower arm |
| DE19612969B4 (en) * | 1996-04-01 | 2004-04-08 | Ina-Schaeffler Kg | Method for producing a rocker arm or rocker arm of a valve train of an internal combustion engine |
| DE19631653A1 (en) * | 1996-08-05 | 1998-02-12 | Hatz Motoren | Rocker arm for an internal combustion engine |
| US5819694A (en) * | 1997-05-15 | 1998-10-13 | Welles Manufacturing Company | Stamped roller-type cam followers with added height |
| US6199527B1 (en) * | 1998-03-12 | 2001-03-13 | Nsk Ltd. | Sheet metal rocker arm, manufacturing method thereof, cam follower with said rocker arm, and assembling method thereof |
| AU3009199A (en) | 1998-03-17 | 1999-10-11 | John Michael Garrison | Compact head assembly for internal combustion engine |
| US6032627A (en) * | 1998-07-28 | 2000-03-07 | Teledyne Industries, Inc. | Compact valve actuation mechanism |
| US6070561A (en) * | 1999-01-25 | 2000-06-06 | General Motors Corporation | Valve actuator with lubrication passage and method of forming |
| JP4601592B2 (en) * | 2006-09-19 | 2010-12-22 | 株式会社オティックス | Rocker arm |
| CN104696037A (en) * | 2015-03-18 | 2015-06-10 | 杭州新坐标科技股份有限公司 | Low inertia high strength roller rocker |
Family Cites Families (20)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3064635A (en) * | 1961-02-21 | 1962-11-20 | Gen Motors Corp | Valve rocker mounting |
| DE1208943B (en) * | 1962-11-24 | 1966-01-13 | Maybach Motorenbau Gmbh | Device for transmitting the control movement to a shaft valve of an internal combustion piston engine |
| US3466073A (en) * | 1967-10-12 | 1969-09-09 | Crane Eng Co Inc | Locked assembly |
| US3621823A (en) * | 1969-08-27 | 1971-11-23 | Ford Motor Co | Frictionless rocker arm fulcrum assembly |
| DE2363891A1 (en) * | 1973-07-13 | 1975-06-26 | Daimler Benz Ag | Valve control system for ic engine - valve rod is controlled by action of lever on adjustable curved surface |
| US4182290A (en) * | 1978-06-22 | 1980-01-08 | Pohle William A | Variable ratio rocker arm |
| AT367172B (en) * | 1980-07-31 | 1982-06-11 | Friedmann & Maier Ag | DRIVING DEVICE FOR INJECTION PUMPS OF INTERNAL COMBUSTION ENGINES |
| US4440121A (en) * | 1982-04-30 | 1984-04-03 | General Motors Corporation | Locknut device for engine rocker arm adjustment |
| JPS5930501U (en) * | 1982-08-23 | 1984-02-25 | 日本ピストンリング株式会社 | Rocker arm with roller |
| US4799464A (en) * | 1983-03-03 | 1989-01-24 | Toledo Stamping & Manufacturing Company | Boat-type rocker arm assembly |
| US4614171A (en) * | 1985-07-05 | 1986-09-30 | W H Industries Inc. | Rocker arm construction |
| US4628874A (en) * | 1985-10-30 | 1986-12-16 | Eaton Corporation | Roller follower axle retention |
| US4674453A (en) * | 1986-01-21 | 1987-06-23 | Dove Jr James E | Rocker arm and method of forming the same |
| US4694788A (en) * | 1986-03-28 | 1987-09-22 | Craig John A | Internal combustion engine rocker arm |
| US4682575A (en) * | 1986-03-31 | 1987-07-28 | Ford Motor Company | Low friction high speed rocker arm |
| US4718379A (en) * | 1986-05-27 | 1988-01-12 | Eaton Corporation | Rocker arm pivot assembly |
| US4724803A (en) * | 1986-05-29 | 1988-02-16 | General Motors Corporation | Rolling contact rocker arm with reaction member, rocker key and roller follower |
| US4727832A (en) * | 1986-06-13 | 1988-03-01 | Mitsubishi Jidosha Kogyo Kabushiki Kaisha | Roller rocker arm |
| US4697473A (en) * | 1986-08-07 | 1987-10-06 | The Henley Group, Inc. | Rocker arm with cam-contacting roller |
| US4796483A (en) * | 1987-09-11 | 1989-01-10 | The Henley Group, Inc. | Cold-formed rocker arm with cam-contacting roller |
-
1988
- 1988-09-06 US US07/241,062 patent/US4848180A/en not_active Expired - Lifetime
-
1989
- 1989-05-03 CA CA000598608A patent/CA1322906C/en not_active Expired - Fee Related
- 1989-06-12 JP JP1149273A patent/JP2802099B2/en not_active Expired - Lifetime
- 1989-09-05 DE DE3929493A patent/DE3929493C2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JP2802099B2 (en) | 1998-09-21 |
| DE3929493C2 (en) | 1997-10-09 |
| JPH0275708A (en) | 1990-03-15 |
| DE3929493A1 (en) | 1990-03-15 |
| US4848180A (en) | 1989-07-18 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKLA | Lapsed |